Revert "Handle --force option correctly in any position"

This reverts commit 0c5617bf8d.

The changes turned out to require bash. Traditionally we have tried to
stay compatible with plain old sh, so this is a revert.

Closes #195.

hg-fast-export.sh

@@ -110,7 +110,7 @@ if [ "true" = "$IGNORECASE" ]; then
     IGNORECASEWARN="true"
 fi;
 
-HG2GIT_ARGS=()
+
 while case "$#" in 0) break ;; esac
 do
   case "$1" in
@@ -125,10 +125,14 @@ do
       # pass --force to git-fast-import and hg-fast-export.py
       GFI_OPTS="$GFI_OPTS --force"
       IGNORECASEWARN="";
+      break
       ;;
-    # pass all other args down to hg2git.py
-	*)
-      HG2GIT_ARGS+=("$1")
+    -*)
+      # pass any other options down to hg2git.py
+      break
+      ;;
+    *)
+      break
       ;;
   esac
   shift
@@ -183,7 +187,7 @@ $(
       --mapping "$GIT_DIR/$PFX-$SFX_MAPPING" \
       --heads "$GIT_DIR/$PFX-$SFX_HEADS" \
       --status "$GIT_DIR/$PFX-$SFX_STATE" \
-      "${HG2GIT_ARGS[@]}" 3>&- || _e1=$?
+      "$@" 3>&- || _e1=$?
     echo $_e1 >&3
   } | \
   {